UPDATE: All Hell Breaks Loose in Cairo

UPDATE: CNN reports seeing machetes, razors, Molotov cocktails, tear gas, and clubs while hearing some gunshots. Mubarak supporters are storming Tahrir Square from all sides, rumored to be accompanied by plainclothes policemen. An Army vehicle has been overturned. Tear gas may have been fired by police.

Smoke or tear gas is seen rising near the north entrance to Cairo's Tahrir Square on Wednesday.

EARLIER: Was just watching CNN. Pro-Mubarak demonstrators, some on horses and camels, have reached Tahrir Square and are violently clashing with anti-Mubarak protesters. Described as a snowball fight with rocks. The PRO group may have been escorted by police. The army is just watching. CNN’s Anderson Cooper and his crew got beaten up on their way to Tahrir Square. Others have been critically injured.

“Pro- and anti-government supporters are clashing in Cairo’s central Tahrir Square, where thousands of demonstrators calling for the ouster of President Hosni Mubarak have been keeping a vigil for days,” the Associated Press reports. The wire service adds that one of its reporters “saw the two sides hitting each other with sticks and some were injured, with their heads bleeding.”

NPR’s Corey Flintoff reported just a short time ago that in downtown Cairo, there was “a counter-demonstration going on. … Hundreds of people who support Hosni Mubarak have come out. … We were surrounded a little while ago by people who wanted to tell how much they support Hosni Mubarak.”